3 r_settings i need explained

can someone tel me what the next 3 things do??

keep in mind i'm trying to build a very detailed cfg only with the muzzleflas & r_flares off.
Maybe some other irritating stuff of light also off like wolfpracticals and so on.

Now these are the 3 r_setting i need kind info:

r_highqualityvideo
r_ext_texture_env_add
r_dlightBacks

i have read some little stuff but if anyone can give me a place on a map zhere you see it's effect it would be nice too.

Big thnx in advance for the helpers.
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r_highqualityvideo = toggle highqualitvideo on/off












:D
put them in blocknote and /exec?
r_highqualityvideo had something to do with some videos playing ingame in Quake afaik.. imo this concerns also the "video" in limbomenu.

r_dlightBacks makes map allover brighter, try to turn it off and you see.
just test them out on cybergames!
r_highqualityvideo - game intro quality.
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